Successfully complete one of the following tasks to get a trophy:

  Bully (Bronze): Take down one opponent. 
  Acrobat (Bronze): Perform a two stunt combo. 
  Adrenaline Junkie (Bronze): Stay in adrenaline mode for 30 seconds. 
  Hoarder (Bronze): Unlock half of all unlockables in career mode. 
  Hangtime (Bronze): Hold a stunt for 2 seconds. 
  Big Air (Bronze): Stay airborne for 3 seconds. 
  Backflip (Bronze): Perform a backflip. 
  Frontflip (Bronze): Perform a frontflip. 
  Woodcutter (Bronze): Collide with 3 trees in a race. 
  Crowdsurfing (Bronze): Collide with the spectators. 
  Friendly (Bronze): Invite someone to a race. 
  Roadrunner (Bronze): Lead a race from start to finish. 
  Berzerk (Silver): Take down three opponents in a row without crashing. 
  Pack Rat (Silver): Unlock all unlockables in career mode. 
  Stingy (Silver): Collect $50000 in career mode without spending them. 
  Frozen (Silver): Hold a stunt for 4 seconds. 
  Untouchable (Silver): Win a career race with your sled intact. 
  Head Splat (Silver): Land on top of another player in an offline match. 
  Rampage (Gold): Take down four opponents in a row without crashing. 
  Wire Fu (Gold): Perform a three stunt combo. 
  Boostaholic (Gold): Stay in adrenaline mode for 60 seconds. 
  Orbit (Gold): Stay airborne for 5 seconds. 
  Double Backflip (Gold): Perform a double backflip. 
  Double Frontflip (Gold): Perform a double frontflip. 
  Online Acrobat (Gold): Achieve 20,000 stunt points in a single online match. 
  Platinum (Platinum): Collect all other trophies.